TITLE
    Macintosh Plus: Imagewriter I Cable Pinouts
Article ID:
Author:
Created:
Modified: 		1761

2/19/86
5/27/93
TOPIC



    Article Change History
    ----------------------
    05/25/93 - CORRECTED
    * To update pinouts for the DB-25 to Circular-8 Cable


    Below is the wiring diagram of the connection between a Macintosh Plus and
    an Apple Imagewriter I. Cables #1 and #2 may be used together for the
    connection or custom cable #3 may be constructed.

DISCUSSION

    CABLE 1
    Macintosh Imagewriter Cable
    590-0169

    Macintosh Imagewriter
    Connector Connector
    (DB-9) (DB-25)

    Comments Signal Pin Pin Signal Comments
    Name Name

    Chassis Ground GND 1 <----> 1 GND Chassis/Frame Ground
    Signal Ground SGND 3, 8 <--> 7 GND Signal Ground
    Transmit Data Tx 5 ----> 3 Rx Receive Data
    Ready to Send HSK 7 <---- 20 DTR Data Terminal Ready
    Signal Ground SGND 8 (Connected to pin 3 on the Macintosh side)
    Receive Data Rx 9 <---- 2 Tx Transmit Data


    CABLE 2
    Macintosh Plus Circular 8 to DB-9 Adapter
    699-0372

    Circular 8 Signal DB-9
    1 HSKo (+12V) 6
    2 HSKi 7
    3 TXD- 5
    4 GND 3*
    5 RXD- 9
    6 TXD+ 4
    7 No Wire
    8 RXD+ 8
    GND 1*

    * Pins 1 and 3 on the DB-9 end are jumpered together.

    The pins on the male end of the circular 8 connector are numbered as shown:

    6 7 8
    3 4 5
    1 2

    CABLE 3

    Macintosh Plus Circular 8 to DB-25 Custom Cable

    Circular 8 DB-25
    1 HSKo (+12V) 6 & 8
    2 HSKi 20 DTR
    3 TXD- 3 RxD
    4 GND 7 GND
    5 RXD- 2 TxD
    6 TXD+ No Wire
    7 No Wire No Wire
    8 RXD+ 7 GND


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